Treadmill is a good exercise machine for performing home cardiovascular exercises.
If you are searching for some affordable and cheap treadmills under 200, then you can consider the following ones, they are the top selling cheap treadmills at Amazon. Of course, for the price, you can only get very basic treadmills.
Stamina InMotion II Manual Treadmill:
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Measures 46.5″ by 43.5″ by 26″ (W x H x D);
42 inches long running/jogging/walking deck;
No motor, self-powered;
With a monitor that is battery-operated to track the exercise speed, time, distance, as well as calories;
A pair of incline positions (eight and ten degrees);
Max weight limit: 250 pounds;
Can be folded up for easy storage.
Phoenix 98516 Easy-Up Manual Treadmill:
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Measures 46″ by 50″ by 21″ (W x H x D);
41.5″ by 13.5″ running belt;
No electric motor;
Folds up and the rollers makes storage easy.
Weight capacity: 250 pound;
Can track your workout distance, time, speed, and calories.
Phoenix Denise Austin 98510 Easy-Up Manual Treadmill:
Rating: 
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Measures 46.5″ x 50″ x 21.1″ (W x H x D);
41″ by 13″ inch walking/jogging surface;
Self-powered treadmill, no motor;
With electronics display which tracks your exercise time, speed, distance, and calories;
Includes a Denise Austin walking video as well as a water bottle.
Folds up for easy storage;
Not recommended for user who are over 250 pounds.
Weslo Cardiostride Plus Manual Treadmill:
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Measures 4’2″ x 1’6 1/2″ x 4’4″
Not motorized treadmill, you are the motor.
Three position inclines, ranges from 13 to 20 percent, help you burn more calories.
200-lb weight capacity;
Features an LCD display;
Folding running deck for storage;
Ninety days warranty on labor as well as parts.
By the way, if you need a high quality treadmill, and treadmill exercise is an important part of your daily workout routine, then a treadmill that is under $200 will not meet your needs, it is recommended to buy a more advanced one.
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